+AC_CHECK_PROGS([XSLTPROC], [xsltproc])
+if test -z "$XSLTPROC"; then
+ AC_MSG_ERROR([xsltproc (from libxslt) is required])
+fi
+AC_CHECK_PROGS([PYTHON], [python python2.3 python2.4 python2.5])
+if test -z "$PYTHON"; then
+ AC_MSG_ERROR([Python is required])
+fi
+